<template>
<div class="app-container">
    <el-input 
    v-model="filterText" 
    placeholder="Filter keyword" 
    style="margin-bottom:30px;" />

    <el-tree 
    ref="tree2" 
    :data="data2" 
    :props="defaultProps" 
    :filter-node-method="filterNode" 
    class="filter-tree" 
    default-expand-all />

</div>
</template>

<script>
import subject from "@/api/teacher/subject"
export default {
    data() {
        return {
            filterText: '',
            data2: [{}],//返回所有分类数据
            defaultProps: {
                children: 'children',
                label: 'title'
            }
        }
    },
    created() {
        this.getAllSubjectList()
    },
    watch: {
        filterText(val) {
            this.$refs.tree2.filter(val)
        }
    },

    methods: {
        getAllSubjectList(){
            subject.getSubjectList()
            .then( res => {
                this.data2 = res.data.list
            })
        },
        filterNode(value, data) {
            if (!value) return true
            return data.title.toLowerCase().indexOf(value.toLowerCase()) !== -1
        }
    }
}
</script>
